Manganese-doped supported palladium catalyst, preparation method thereof and application

Abstract

The invention provides a manganese-doped supported palladium catalyst. A preparation method of the catalyst includes the steps: adding PdC12 into propanediol cyclic carbonate, and performing reduction reaction for 0.5-3h under hydrogen pressure ranging from 1MPa to 4MPa at the temperature ranging from 20 DEG C to 60 DEG C to obtain Pd nano-solution; adding Al2O3 carriers into Mn(NO3)2 solution, performing soaking for 5-15min by an incipient-wetness impregnation method, calcining mixture for 3h at the temperature ranging from 200 DEG C to 500 DEG C after drying, soaking the calcined mixture for 5-15min in the Pd nano-solution, calcining the soaked mixture for 2h at the temperature ranging from 200 DEG C to 500 DEG C after drying to obtain the catalyst. The catalyst can be used for catalytic oxidation reaction of methylbenzene. The prepared catalyst is high in active component dispersion and small in particle diameter and still keeps higher activity and stability under low loading capacity, the preparation method is simple and environmentally friendly, carriers are low in cost and easily acquired, the cost of the catalyst is greatly reduced, and industrialization is facilitated.

Description

(1) Technical field [0001] The invention belongs to the technical field of catalysts, in particular to a manganese-doped palladium supported catalyst (referred to as: Mn-Pd / Al 2 o 3 ) and its preparation method, and its application in catalytic oxidation of toluene. (2) Background technology [0002] Volatile organic compounds (volatile organic compounds, VOCs) are an important part of air pollutants. In 2010, the State Council listed volatile organic compounds as air pollutants that need key prevention and control. VOCs mainly come from industrial production and social life, among which industrial production emits the most VOCs. In petrochemical, pharmaceutical and other production fields, toluene is widely used as a solvent; in daily life, toluene is also contained in interior decoration materials such as paints and adhesives, and daily chemical products such as detergents. Toluene has become one of the main pollutants of industrial waste gas and indoor air. VOCs gener...

AI Technical Summary

Problems solved by technology

Supported noble metal catalysts have the advantages of high catalytic activity, low light-off temperature, good thermal stability, and strong universality. They have been extensively studied in the field of catalytic oxidation of VOCs. The preparation cost is too high

Chinese patent CN14884435A proposes a catalytic combustion catalyst and its preparation method. The catalyst has a high catalytic combustion conversion efficiency for organic waste gas, but needs to use a relatively high content of precious metal elements, resulting in high catalyst preparation costs.

The price of non-precious metal catalysts is relatively cheap, but the preparation process is cumbersome, the light-off temperature is high, and the catalytic activity is poor, so the industrial application is limited.

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